L.W.
Hi K.,
That could definitely be implantation bleeding. I use fertility friend online when I track my cycles (I'm pregnant now). Here is the link to my positive HPT cycle.
http://www.fertilityfriend.com/home/194edc
I have a clear implatation dip at 6 days past ovulation and also had some implantation bleeding at six seven and nine dpo. I also had the same with my previous pregnancy that I miscarried.
Good luck this cycle! Happy and healthy 9 months to you if this is it :)